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Regulation of leaf senescence by reproductive sink intensity in cowpea vigna unguiculata l. walp

Annals of Botany (London) 61(6): 655-658

Regulation of leaf senescence by reproductive sink intensity in cowpea vigna unguiculata l. walp

The relationship between seed number per pod and senescence of the leaf in its axial was examined in a determinate cowpea (Vigna unguiculata L. Walp) variety C.779. The seed number per pod was reduced at all fruiting nodes by surgical excision of part of the 4-d-old pod. Leaf senescence as measured by loss of leaf area, chlorophyll content and soluble protein was slowed down in leaves supporting the development of an artificially reduced number of seeds. Diminished nitrogen mobilization from the leaf could not account for the reduced rate of leaf senescence. The result suggests the involvement of a senescence signal from the developing seeds to the leaf in its axil. Development of the basal half of the excised pod in the cowpea provides a unique system for manipulating seed number per pod.

Accession: 006288971

DOI: 10.1093/aob/61.6.655

Related references

Patel, K., G.; Rao, T.V.Ramana, 2007: Effect of simulated water stress on the physiology of leaf senescence in three genotypes of cowpea (Vigna unguiculata (L.) Walp). The present study deals with the impact of simulated water stress on the physiology of leaf senescence in three genotypes of cowpea (Vigna unguiculata), viz. Akshay-102(A), Gomti vu-89(G) and Pusa Falguni(P). The induced water stress created by w...

Stewart, K.A.; Summerfield, R.J.; Ndunguru, B.J., 1978: Effects of source-sink manipulations on seed yield of cowpea (Vigna unguiculata (L.) Walp.). 1. Defoliation. Various defoliation treatments were imposed on nodule-dependent cowpea cv. K 2809 plants grown in pots under simulated tropical conditions and were effective in creating markedly different final seed yields. Depending on the relative age of leaves...

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Gwathmey, C.O., 1991: The adaptive significance of delayed monocarpic senescence in cowpea (Vigna unguiculata Walp.). The adaptive significance of delayed monocarpic senescence was studied in V. unguiculata grown in field experiments for three seasons at Riverside, California. Senescence was delayed by 2 types of treatment: growing genotypes (7964 and 8517) which...

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Sharma, A.N.; Chaudhari, D.N.; Pavaya, R.P.; Shah, R.M., 1987: Determination of leaf area in cowpea (Vigna unguiculata L. Walp). Analysis of data on leaf length (L), maximum leaf breadth (B) and leaf area from 12 genotypes differing in leaf size and shape indicated that leaf area could be estimated using the formula (L x B) x 0.6654. The method is recommended for estimating...

Alves, J.M.; Guimaraes, E. da C.; Alves, J.S.; Jacob Neto, J., 2002: Molybdenum application in cowpea (Vigna unguiculata (L.) Walp) leaf. An experiment was conducted in Rio de Janeiro, Brazil, to determine the effect of Mo fertilizers on cowpea (cv. CNC x 409-11F-P2) leaves. The seeds were inoculated with Rhizobium strain Br 2001. Mo fertilizer was applied at 0, 100, 200, 400 and 80...

Fawole, I., 1988: A nonpetiolate leaf mutant in cowpea vigna unguiculata l. walp. Reciprocal differences in a petiole trait were observed in segregating populations of cowpea crosses. Mutant plants appeared only when lfe BPC, a branched peduncle cultivar, was the female parent. In four crosses, the nonpetiolate leaf mutant gave...

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